From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Test results for crankcase pressure at various speeds with a crankcase breather only.
| Identifier | ExFiles\Box 82\5\ scan0091 | |
| Date | 21th April 1937 | |
| ( 2 ) 2) With crankcase breather only. No breather from rocker cover to air silencer. Speed. 20 30 40 50 60 70 80 90 Pressure in } inches of water. } 0.3 0.3 0.4 0.4 0.4 0.4 0.5 0.5 Further tests will be carried out at the next opportunity, with the crankcase breather blanked off, to find if this produces any increase in crankcase pressure or oil consumption. ----------- Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}/IMW.{Ivan M. Waller - Head of Chateauroux} f Ivan. Wallin | ||